Long Rod Post Composite Insulator

Composite Long Rod Insulator

● Application: Used for overhead contact system of electrified railways;

● Color: Red, Brown, Gray or Customer's requirement;

● Applicable Standard: IEC, GB, BS, ANSI, AS or Customer's requirement;

● Tube: Fiber glass core;

Feature

Compared with traditional ceramic insulators, the use of polymer/silicon rubber-based insulators has several advantages, such as light weight, non-brittleness, hydrophobicity, resistance to ozone and UV radiation, seismic shock resistance, self-cleaning properties, and damage resistance.
The exterior shed is moulded in rubber using the latest state-of-the-art injection moulding machines from .
End fittings for connection to support structures or conductors are made of malleable cast iron and are suitably hot IP galvanized. O Metal end fittings are crimped on a microprocessor controlled automatic hydraulic crimping machine. O Various types of long rod insulators available with voltage ratings from 11 kV to 33 kV ball and socket; tongue and clevis type end fittings.

Structural Features

The core wire is the insulating part of the composite insulator, made of fiberglass rods and designed to ensure the necessary mechanical properties. The fiberglass rod used to make silicone rubber insulators is a core material manufactured through a protruding process using boron-free ECR grade fiberglass with the required mechanical and electrical properties.

Physical Properties of Insulators

The properties and composition of composite insulators are similar to those specified in Clause 3 of the standard IEC-61109. The raw material of the insulating material (core and fins) is 100% Silicon Rubber, before the process of adding additives. The carbon content in the finished product will not exceed 20% by weight. Usually long rod polymer insulators are composed of polymer shell, ECR glass fiber rods, metal end joints, corona rings, etc.

What are the advantages of composite long rod polymer insulators?

easy to maintain
Porcelain insulators have zero breakdown, zero detection, and zero replacement issues, while long rod polymer insulators do not. The long rod polymer insulator requires almost no maintenance after installation, which greatly reduces the maintenance cost.
Generally, the suspended porcelain insulator is an internal glue-installed structure, and the steel feet are embedded in the porcelain ball head. Therefore, at the working voltage, the electric field strength is most concentrated at the steel feet. Adhesives are used for inner glue. Due to the different thermal expansion coefficients of porcelain parts and cement steel feet, when the porcelain insulators are subjected to changes in heat and cold, the differences in the thermal expansion coefficients of each part will cause the porcelain parts to withstand greater compressive stress and shearing action. stress, so the porcelain parts are easy to crack or break down, becoming a zero-value insulator. The long-rod polymer insulator is a non-breakdown structure in mechanism, and there is no zero-value problem.
Excellent stain resistance
The good anti-pollution flashover performance of composite long-rod polymer insulators is an important reason for its rapid development. Pollution flashover caused by insulator surface pollution is the main threat to the safe operation of the power grid, and it is also a decisive factor in the selection of transmission line insulators. The surface of the porcelain insulator is a high-energy surface, which forms a continuous water film after being wetted by water. At the same time, it is polluted and prone to pollution flashover. Therefore, manual cleaning or application of silicone rubber paint should be used in daily operations.
The constituent material of the composite long-rod polymer insulator is silicone rubber, and the surfaces of the umbrella skirt and the sheath are low-energy surfaces with good hydrophobicity and hydrophobic migration. Even in a wet and dirty environment, the surface of the composite insulator shed will not form a continuous water film, but only form independent water droplets, so the composite insulator has good pollution resistance. Although the hydrophobicity of composite insulators deteriorates after a period of operation, the contamination resistance is still higher than that of porcelain insulators.
mechanical behavior
The axial tensile strength of the glass fiber mandrel for composite insulators is very high, generally above 600MPa, and the tensile strength of the latest acid-resistant mandrel is above 1000MPa, which is 5-10 times the strength of high-quality carbon steel. But the mass per unit length of the mandrel material is much lighter than both porcelain and steel. Composite long rod polymer insulators can make very strong, lightweight products.
Anti-aging properties
Porcelain insulators have nearly a hundred years of operating experience and strong anti-aging ability. For a long time after being put into production, if zero damage does not occur, the aging and replacement can be ignored. The composite long rod polymer insulator belongs to the organic material insulator. Affected by factors such as atmosphere, high and low temperature, ultraviolet rays, and strong electric fields during operation, the organic materials in the umbrella sheath will age and deteriorate, resulting in poor insulation performance of composite insulators. decrease, affecting the service life of composite insulators. However, from the current operating experience, the service life of composite long rod polymer insulators can generally reach more than 10 years.
economic performance
According to relevant calculations, whether it is a new line or an old line renewal, the use of composite long rod polymer insulators is more economical than porcelain insulators. The later operation and maintenance workload of composite insulators is small, and zero value detection is not required.

Specification